Valve.



UNITED STATES PATENT OFFICE.

EDWARD SEAVER, JR., 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR, ."BY 'MESNE-AS- SIGNMENTS, TO THE COLONIAL TRUST COMPANY, TRUSTEE, OFIITTSBURGH, PEN N SYLVANIA, A. CORPORATION OF PENNSYLVANIA.

VALVE.

Specification of Letters Patent.

Patented Apr. 9, 1912.

Application filed September 22, 1910. Serial No. 583,206.

a citizen of the United States, and a resident of Pittsburgh, in the county of Alle- 5 gheny and State of Pennsylvania, have made a new and useful Invention in Valves, of which the followingis a specification.

This invention relates to valves and particularly toturbine supply valves. V

An object of my invention is to produce a valve adapted to be employed with marine turbines and which maybe operated to de-. liver motive fluid to the cruisingand full ahead stages of the turbine, and also to the reversing stage or stages of the turbine. This and other objects I attain by means of a valve embodying the features herein described and illustrated in the drawing accompanying this application and forming a part thereof.

In the drawing: I have shown a vertical section of a valve embodying my invention. The valve illustrated consists of a casing 3 and three separate disks 4, 5 and 6 which are mounted on a single valve stem 7 and are inclosed within the casing 3. The casing is provided at one end, preferably the lower end, with an inlet port 8, which communicates with the interior ofthe casing and is adapted to communicate with a source of fluid supply through suitable piping, not shown. Ports 9, 10 and 11 are also provided in the casing 3 and are respectively adapted to communicate with the cruising stage, the full ahead stage and the reversing stage or stages of the turbine. The port 9 is located on one side of the casing 3 and communicates with an annular passage 12 formed in the casing and communicating with the in terior of the casing through ports 13. The port 10 is located on the other side of the casing 3 and communicates with an annu lar passage 14: formed within the casing and separated from the passage 12 by means of a diaphragm 15. The passage 14 communicates with the interior of the casing through ports 16.

'A valve-disk housing 17 for the disks 4 and 5-is located in the space surrounded by the passages 12 and 14 and is secured to the casing 3 in any suitable manner, as for example, by means of bolts 18 (one of which is shown). The housing 17 isprovided with ports, which register with the ports 13 and 16 inthe casing. Annular seats 19 areprovformed with the-housing. The adapted to seat on the seats 20 to close communication between theinterior of the easing 3 and the port 10.

vided on each side of the row of ports registering wlth the ports 13,

and the disk 4 is adapted to seat on them to close the flow of fluid through the ports 13. Similar seats.

20 are provided on each side of the ports registering with the ports 16 of the casing, and like the seats 19, are shown integrally The port 11 communicates with the reversing portion of the turbine and communicates with an annular pasage 22 formed within the casing and provided with ports 23, which disk 5 is i communicate with the interior of the casing.

The passage 22 surrounds a valve-disk housing 24, which is secured in place by means of bolts 25 and is provided with ports, which register with the ports 23'of the casing.

The housing is provided with seats 26 located on each side of the ports registering with the ports 23 and on which the disk 6 seats to close communication between the interior of the casing and the port 11.

' The casing is divided transversely at 27 for the purpose of simplifying the operation of introducing and securing the housing 24: in place. The upper end of the casing is provided with a cover 28 through which the valve stem 7 projects. The lower end of the stem 7 is secured in place by a bearing or guide 29, which is shown located centrally above the port 8 and held in place by means of a spider 30. The stem is capable of being reciprocated axially and the disks are so arranged that motive fluid will be delivered first to the cruising stage of the turbine through the port9 and then to the full ahead stage through the port 10 during the upward movement of the stem; and motive fluid will be delivered to the reversing stage of the turbine through the port 11 after the disks 5 and 4 have successively closed the ports 10 and 9'during the downward motion of the stem.

All the disks are loosely mounted on the stem and are capable of reciprocation along it. The disk 4 is normally held against a collar 31 formed on the stem and-located below the disk and the disk 6 is normally held against a nut 32 located on the stem above the disk. The disk 5 is held in place by means of coiled springs 33 and 34 so arby a normal pressure when the disks 4 and 6 are seated, and the stem 7 is in the intermediate or normal position.

The operation of the valve is as follows: Then it is desired to deliver motive fluid to the ahead portion of the turbine, the valve stem 7 is raised. The upward motion of the stem lifts the valve-disk 4 from its seat and supplies motive fluid-from the interior of the casing through the ports 13, the passage 12 and the port 9 to the cruising stage of the turbine. The raising of the valve-disk 4 compresses the springs 33 and 34: and forces the disk 6 more firmly against its seat and tends to raise the disk 5 from its seat. The disk 5 is shown as of the puppet valve type; and while it is balanced, when open, it is held to its seat by an unbalanced fluid pressure, when closed. This unbalanced pressure is reinforced by the downward pressure of the spring 33, which is of such strength that it preponderates over the spring As the valve stem 7 continues in its upward motion, the force, transmitted by the spring 341 to the valve-disk 5, is gradually increased as the spring 34 is compressed until it is capable of overcoming the closing fluid pressure, and the pressure transmitted by the spring 33. As soon as the disk leaves its seat, it is balanced with respect to fluid pressure and consequently will move to quickly open the ports 16 and deliver motive fluid to the full ahead stage of the turbine through the port 10. A further raising of the valve stem will result in a further opening of the valves 4 and 5. The downward movement of the stem 7 will first seat the disk 5 and close off the flow of fluid to the full ahead stage of the turbine and will then seat the disk at and close off the flow of fluid to the cruising stage and entirely out off the delivery of fluid to the ahead portion of the turbine. A further downward movement of the valve stem 7--that is a movement below the intermediate position-will cause the nut 32 on the stem to engage the disk 6 and move it to open the ports 23 and admit fluid through the port 11 to the reversing portion of the turbine. This movement of the disk 6 is opposed by the compression springs 33 and 34, and results in forcing the disks 1 and 5 firmly against their seats.

I have shown a hydraulically actuated piston 35 for controlling the operation of the turbine supply valve shown. The pis ton 35 is mounted on the stem 7 and is located within a cylinder 36, to which liquid may be delivered through pipes 37 and 38. The pipe 37 communicates with the cylinder 36 below the piston 35 and also with the casing of the valve 39; and the piping 38 communicates with the cylinder 36 above the piston and with the casing of the valve 39. A liquid supply pipe 10 and a liquid discharge pipe 11 also communicates with the casing of the valve 39 and the valve is so arranged that it is capable of delivering liquid to the cylinder 36 below the piston 35 and discharging it from above the piston; or of deliveringliquid to the cylinder above the piston and discharging it from below the piston. ith this arrangement, the

valve 39 may be employed in controlling the operation of the turbine supply valve by controlling the delivery and discharge from the cylinder 36. It will be apparent that any other means may be employed for recip rocating the valve stem, such for example as a hand wheel.

Having thus described my invention,what Iclaim is:

1. A valve comprising a casing provided with separate delivery ports, separate disks mounted on a single valve stem for controlling the delivery through the separate ports, and means whereby said disks are adapted to operate successively comprising springs of different expansive force.

2. A valve comprising a casing provided with separate fluid delivery ports, a valve stem, separate disks mounted on said stem for independently controlling said ports and springs interposed bet-ween the disks, the spring for one disk preponderating in expansive force over the spring for another disk.

3. A valve comprising a casing provided with separate fluid delivery ports, a valve stem, valve disks for independently controlling said ports loosely mounted on said stem comprising springs of different expansive force and means for yieldingly holding said disks in place on said stem.

41. A valve comprising a casing provided with two fluid delivery ports, a valve stem, two separate disks mounted on said stem for independently controlling said ports and yielding means for holding one valve to its seat with an increasing pressure as the other valve is moved from its seat.

5. A valve comprising a casing provided with three separate fluid delivery ports, a valve stem, three separate disks for independently controlling said ports mounted on said stem and yielding means located between said disks for holding them in place on said stem yielding means for one preponderating in expansive force over the other.

In testimony whereof, I have hereunto subscribed my name this 20th day of September, 1910.

EDWARD SEAVER, JR. WVitnesses:

C. W. MGGHEE, E. W. MCOALLISTER.

Copies of this patent may be obtained for five cents eaeh,"by addressing the Commissioner of Patents, Washington, D. G. 

